Gotham Zip Line: Have you ever wanted to skim across a city like the Dark Knight? No? Understandable. But the new Fox show wants you to anyway. (Between the Convention Center and the Hilton Bayfront)

PARTY

Penny Dreadful: On a light night for bashes, Showtime's party stands out with stars Josh Hartnett and Eva Green. (7 p.m., U.S. Grant Hotel)

FRIDAY, JULY 25

FILM

Horns: Daniel Radcliffe will make his first Comic-Con appearance in support of this horror flick. (3 p.m., Hall H)

TV

Game of Thrones: Author and executive producer George R.R. Martin brings his trademark awkwardness to answer burning questions, with casting for season five expected to be announced at the session. (1:40 p.m., Hall H)

EVENT

Dig Scavenger Hunt: To pimp its new event series, USA is inviting Snapchat-savvy fans to scour the Gaslamp district for clues that could, for 40 of them, lead to a meet-and-greet with creator Tim Kring at 5 p.m.

Warner Bros. vs. Marvel: The two powerhouses will vie for the "Who Won Saturday?" crown. Warners is bringing Mad Max and The Hobbit, and will likely tease Batman v Superman: Dawn of Justice. Marvel is expected to deliver Avengers and Ant-Man surprises. (10 a.m. for Warners; 5:30 p.m. for Marvel; both in Hall H)

TV

American Horror Story: The FX anthology makes its debut in San Diego. (7 p.m., Room 6DE)